The "Seinfeld" diner.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

An aptly-named street near the birthplace of the modern LGBT rights movement.

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.

This storied music venue was once a tavern that housed an Italian Anarchist book club and prohibition parties; today it's a community space for artists and musicians.

The oldest certified bowling alley in the United States is in the basement of this century-old bar.

A giant, Gilded Age mansion that once belonged to the beer baron of Milwaukee.

The palatial McDonald's that inspired Wesley Willis.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

This morbid, delightful curiosity shop offers everything from animal bones to human teeth.

This demon atop the Notre-Dame de Paris looks utterly bored.

The celebrated eyesore created by starry-eyed sweethearts.

A museum dedicated to one of Paris’s most famous residents, tucked into a corner of one of the city’s most famous squares.

On this romantic tidal island reachable only at low tide the tomb of a famous French writer overlooks the sea.

The video game-themed street art first popped up in the French city.

To the famous surrealist artist, liberty required two torches held high.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

An ancient ossuary in Rouen.

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

A popular shrine where the Blessed Virgin allegedly appeared in 1830, displaying a holy armchair and two incorruptible remains of Lady Saints.

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

Two awe-inspiring globes from the reign of the Sun King hang from the ceiling of France's national library.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.